I.B. 48008
Page 7
Effective 11/97
EXTERNAL INHIBIT
If the controller contains an autotransformer for reduced-
voltage starting, DC voltage will not be applied until after
transition to full voltage. Synchronization is blocked by
withholding 115 VAC from terminals 115 and IN-. When
voltage is applied to terminals 115 and IN-, the Mark V will
go into the synchronizing mode.
SYSTEM PROTECTION
This controller includes circuits that provide a means of
shutting down in the event of a stalled motor, excessive
start time (time-out period exceeded), or pole slippage
after synchronization. Where the protection system
consists of contacts in a control circuit, use the normally-
closed (NC) contacts of RLY3 to open the
Fig. 5 Synchronous Control Board Layout
